- Author: William J. Watkins, William F. Shughart II
- Language: English
- Year: 2014
- Author: William H. Watkins
- Language: English
- Year: 2022
- Author: William H. Watkins
- Language: English
- Year: 2022
- Author: William H. Watkins
- Language: English
- Year: 2001
- Author: Ronald Sterkenburg, Frank Delp, Michael J. Kroes, William Alfred Watkins
- Language: English
- Year: 2013
- Author: William J. Watkins Jr. (auth.)
- Language: English
- Year: 2004